#!/bin/sh
# -*- tab-width:4;indent-tabs-mode:nil -*-
# ex: ts=4 sw=4 et

# /bin/sh on Solaris is not a POSIX compatible shell, but /usr/bin/ksh is.
if [ `uname -s` = 'SunOS' -a "${POSIX_SHELL}" != "true" ]; then
    POSIX_SHELL="true"
    export POSIX_SHELL
    # To support 'whoami' add /usr/ucb to path
    PATH=/usr/ucb:$PATH
    export PATH
    exec /usr/bin/ksh $0 "$@"
fi
unset POSIX_SHELL # clear it so if we invoke other scripts, they run as ksh as well

RUNNER_SCRIPT_DIR={{runner_script_dir}}
RUNNER_SCRIPT=${0##*/}

RUNNER_BASE_DIR={{runner_base_dir}}
RUNNER_ETC_DIR={{runner_etc_dir}}
RUNNER_LIB_DIR={{platform_lib_dir}}
RUNNER_LOG_DIR={{runner_log_dir}}
# Note the trailing slash on $PIPE_DIR/
PIPE_DIR={{pipe_dir}}
RUNNER_USER={{runner_user}}
PLATFORM_DATA_DIR={{platform_data_dir}}
SSL_DIST_CONFIG=$PLATFORM_DATA_DIR/ssl_distribution.args_file
RIAK_VERSION="git"

WHOAMI=$(whoami)

# Make sure this script is running as the appropriate user
if ([ "$RUNNER_USER" ] && [ "x$WHOAMI" != "x$RUNNER_USER" ]); then
    type sudo > /dev/null 2>&1
    if [ $? -ne 0 ]; then
        echo "sudo doesn't appear to be installed and your EUID isn't $RUNNER_USER" 1>&2
        exit 1
    fi
    echo "Attempting to restart script through sudo -H -u $RUNNER_USER" >&2
    exec sudo -H -u $RUNNER_USER -i $RUNNER_SCRIPT_DIR/$RUNNER_SCRIPT $@
fi

# Warn the user if ulimit -n is less than 1024
ULIMIT_F=`ulimit -n`
if [ "$ULIMIT_F" -lt 1024 ]; then
    echo "!!!!"
    echo "!!!! WARNING: ulimit -n is ${ULIMIT_F}; 1024 is the recommended minimum."
    echo "!!!!"
fi

# Make sure CWD is set to runner base dir
cd $RUNNER_BASE_DIR

# Make sure log directory exists
mkdir -p $RUNNER_LOG_DIR

# Make sure the data directory exists
mkdir -p $PLATFORM_DATA_DIR

# Warn the user if they don't have write permissions on the log dir
if [ ! -w $RUNNER_LOG_DIR ]; then
    echo "!!!!"
    echo "!!!! WARNING: $RUNNER_LOG_DIR not writable; logs and crash dumps unavailable."
    echo "!!!!"
fi

# Extract the target node name from node.args
NAME_ARG=`egrep '^\-s?name' $RUNNER_ETC_DIR/vm.args`
if [ -z "$NAME_ARG" ]; then
    echo "vm.args needs to have either -name or -sname parameter."
    exit 1
fi

# Extract the target cookie
COOKIE_ARG=`grep '^\-setcookie' $RUNNER_ETC_DIR/vm.args`
if [ -z "$COOKIE_ARG" ]; then
    echo "vm.args needs to have a -setcookie parameter."
    exit 1
fi

# Identify the script name
SCRIPT=`basename $0`

# Parse out release and erts info
START_ERL=`cat $RUNNER_BASE_DIR/releases/start_erl.data`
ERTS_VSN=${START_ERL% *}
APP_VSN=${START_ERL#* }

# Add ERTS bin dir to our path
ERTS_PATH=$RUNNER_BASE_DIR/erts-$ERTS_VSN/bin

# Setup command to control the node
NODETOOL="$ERTS_PATH/escript $ERTS_PATH/nodetool $NAME_ARG $COOKIE_ARG"
NODETOOL_LITE="$ERTS_PATH/escript $ERTS_PATH/nodetool"

# Common functions

# Ping node without allowing nodetool to take stdin
ping_node() {
    $NODETOOL ping < /dev/null
}

# Set the PID global variable, return 1 on error
get_pid() {
    PID=`$NODETOOL getpid < /dev/null`
    ES=$?
    if [ "$ES" -ne 0 ]; then
        echo "Node is not running!"
        return 1
    fi

    # don't allow empty or init pid's
    if [ -z $PID ] || [ "$PID" -le 1 ]; then
        return 1
    fi

    return 0
}


# Scrape out SSL distribution config info from vm.args into $SSL_DIST_CONFIG
rm -f $SSL_DIST_CONFIG
sed -n '/Begin SSL distribution items/,/End SSL distribution items/p' \
    $RUNNER_ETC_DIR/vm.args > $SSL_DIST_CONFIG

# Check the first argument for instructions
case "$1" in
    start)
        # Make sure there is not already a node running
        RES=`ping_node`
        if [ "$RES" = "pong" ]; then
            echo "Node is already running!"
            exit 1
        fi
        # Sanity check the app.config file
        RES=`$NODETOOL_LITE chkconfig $RUNNER_ETC_DIR/app.config`
        if [ $? != 0 ]; then
            echo "Error reading $RUNNER_ETC_DIR/app.config"
            echo $RES
            exit 1
        fi
        HEART_COMMAND="$RUNNER_SCRIPT_DIR/$SCRIPT start"
        export HEART_COMMAND
        mkdir -p $PIPE_DIR
        $ERTS_PATH/run_erl -daemon $PIPE_DIR $RUNNER_LOG_DIR \
            "exec $RUNNER_SCRIPT_DIR/$SCRIPT console" 2>&1

        # Wait for the node to come up. We can't just ping it because
        # distributed erlang comes up for a second before emqtt crashes
        # (eg. in the case of an unwriteable disk). Once the node comes
        # up we check for the node watcher process. If that's running
        # then we assume things are good enough. This will at least let
        # the user know when emqtt is crashing right after startup.
        WAIT=${WAIT_FOR_ERLANG:-15}
        while [ $WAIT -gt 0 ]; do
            WAIT=`expr $WAIT - 1`
            sleep 1
            RES=`ping_node`
            if [ "$?" -ne 0 ]; then
                continue
            fi
	    echo "emqtt is started successfully!"
            exit 0
        done
        echo "emqtt failed to start within ${WAIT_FOR_ERLANG:-15} seconds,"
        echo "see the output of 'emqtt console' for more information."
        echo "If you want to wait longer, set the environment variable"
        echo "WAIT_FOR_ERLANG to the number of seconds to wait."
        exit 1
        ;;

    stop)
        UNAME_S=`uname -s`
        case $UNAME_S in
            Darwin)
                # Make sure we explicitly set this because iTerm.app doesn't for
                # some reason.
                COMMAND_MODE=unix2003
        esac

        # Get the PID from nodetool
        get_pid
        GPR=$?
        if [ "$GPR" -ne 0 ] || [ -z $PID ]; then
            exit $GPR
        fi

        # Tell nodetool to initiate a stop
        $NODETOOL stop
        ES=$?
        if [ "$ES" -ne 0 ]; then
            exit $ES
        fi

        # Wait for the node to completely stop...
        while `kill -s 0 $PID 2>/dev/null`;
        do
            sleep 1
        done
        ;;

    restart)
        ## Restart the VM without exiting the process
        $NODETOOL restart
        ES=$?
        if [ "$ES" -ne 0 ]; then
            exit $ES
        fi
        ;;

    reboot)
        ## Restart the VM completely (uses heart to restart it)
        $NODETOOL reboot
        ES=$?
        if [ "$ES" -ne 0 ]; then
            exit $ES
        fi
        ;;

    ping)
        ## See if the VM is alive
        ping_node
        ES=$?
        if [ "$ES" -ne 0 ]; then
            exit $ES
        fi
        ;;

    attach)
        if [ "$2" = "-f" ]; then
          echo "Forcing connection..."
        else
          # Make sure a node is running
          RES=`ping_node`
          ES=$?
          if [ "$ES" -ne 0 ]; then
              echo "Node is not running!"
              exit $ES
          fi
        fi

        shift
        exec $ERTS_PATH/to_erl $PIPE_DIR
        ;;

    console)
        RES=`ping_node`
        if [ "$RES" = "pong" ]; then
            echo "Node is already running - use '$SCRIPT attach' instead"
            exit 1
        fi
        # Sanity check the app.config file
        RES=`$NODETOOL_LITE chkconfig $RUNNER_ETC_DIR/app.config`
        if [ $? != 0 ]; then
            echo "Error reading $RUNNER_ETC_DIR/app.config"
            echo $RES
            exit 1
        fi
        # Setup beam-required vars
        ROOTDIR=$RUNNER_BASE_DIR
        BINDIR=$ROOTDIR/erts-$ERTS_VSN/bin
        EMU=beam
        PROGNAME=`echo $0 | sed 's/.*\///'`
        CMD="$BINDIR/erlexec -boot $RUNNER_BASE_DIR/releases/$APP_VSN/$SCRIPT \
            -embedded -config $RUNNER_ETC_DIR/app.config \
            -pa $RUNNER_LIB_DIR/basho-patches \
            -args_file $RUNNER_ETC_DIR/vm.args -- ${1+"$@"}"
        export EMU
        export ROOTDIR
        export BINDIR
        export PROGNAME

        # Dump environment info for logging purposes
        echo "Exec: $CMD"
        echo "Root: $ROOTDIR"

        # Log the startup
        logger -t "$SCRIPT[$$]" "Starting up"

        # Start the VM
        exec $CMD
        ;;
    chkconfig)
        RES=`$NODETOOL_LITE chkconfig $RUNNER_ETC_DIR/app.config`
        if [ $? != 0 ]; then
            echo "Error reading $RUNNER_ETC_DIR/app.config"
            echo $RES
            exit 1
        fi
        echo "config is OK"
        ;;
    escript)
        shift
        $ERTS_PATH/escript "$@"
        ;;
    version)
        echo $RIAK_VERSION
        ;;
    getpid)
        # Get the PID from nodetool
        get_pid
        ES=$?
        if [ "$ES" -ne 0 ] || [ -z $PID ]; then
            exit $ES
        fi
        echo $PID
        ;;
    *)
        echo "Usage: $SCRIPT {start|stop|restart|reboot|ping|console|attach|chkconfig|escript|version|getpid}"
        exit 1
        ;;
esac

exit 0
